function mult(multipler=1.1){
let range = SpreadsheetApp.getActiveRange();
let data = range.getValues()
.map(row=>row.map(value=>((typeof value) === (typeof 1))?value*multipler:value));
range.setValues(data);
};
function onOpen(e){
SpreadsheetApp.getUi()
.createMenu("menu")
.addItem("+ 10%", "mult")
.addToUi();
};